:root {
  color-scheme: light dark;
  --background: #f6f5ff;
  --surface: rgba(255, 255, 255, 0.82);
  --text: #120d26;
  --secondary: #625d72;
  --line: rgba(18, 13, 38, 0.12);
  --indigo: #6b59fa;
  --link: #5740df;
  --coral: #ff577a;
  --mint: #1accdb;
  --amber: #ffa12e;
  --sky: #2996ff;
  --violet: #9e4fff;
  --shadow: 0 20px 56px rgba(59, 44, 136, 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 5% 4%, rgba(107, 89, 250, 0.2), transparent 34rem),
    radial-gradient(circle at 94% 12%, rgba(26, 204, 219, 0.16), transparent 30rem),
    radial-gradient(circle at 74% 94%, rgba(255, 87, 122, 0.1), transparent 28rem),
    var(--background);
  line-height: 1.58;
}

a {
  color: var(--link);
  text-underline-offset: 0.18em;
}

a:hover { text-decoration-thickness: 0.14em; }

.site-header,
.page,
.site-footer {
  width: min(100% - 2rem, 900px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.35rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.72rem;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 780;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 2.35rem;
  height: 2.35rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 0.8rem;
  background: linear-gradient(145deg, var(--indigo), var(--violet) 46%, var(--mint));
  box-shadow: 0 7px 20px rgba(83, 66, 213, 0.3);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  border: 0.12rem solid rgba(255, 255, 255, 0.92);
  border-radius: 48% 52% 45% 55%;
  transform: rotate(-11deg);
}

.brand-mark::before { inset: 0.48rem 0.42rem; }
.brand-mark::after { inset: 0.78rem 0.7rem; opacity: 0.84; }

.language-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
  font-size: 0.88rem;
}

.language-nav a {
  min-width: 2.5rem;
  padding: 0.36rem 0.58rem;
  border-radius: 999px;
  color: var(--secondary);
  text-align: center;
  text-decoration: none;
}

.language-nav a[aria-current="page"] {
  color: #fff;
  background: var(--indigo);
}

.hero { padding: clamp(2rem, 7vw, 4.8rem) 0 clamp(1.8rem, 5vw, 3.3rem); }

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--link);
  font-size: 0.82rem;
  font-weight: 780;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1, h2, h3 {
  line-height: 1.16;
  text-wrap: balance;
}

h1 {
  max-width: 16ch;
  margin: 0;
  font-size: clamp(2.35rem, 9vw, 4.9rem);
  letter-spacing: -0.055em;
}

.lede {
  max-width: 65ch;
  margin: 1.2rem 0 0;
  color: var(--secondary);
  font-size: clamp(1.02rem, 2.5vw, 1.22rem);
}

.summary-grid,
.language-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.9rem;
  margin: 0 0 1.8rem;
}

.summary-card,
.language-card,
.content-card,
.faq details {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.summary-card,
.language-card {
  padding: 1.15rem;
  border-radius: 1.4rem;
}

.summary-card strong,
.language-card strong {
  display: block;
  margin-bottom: 0.25rem;
}

.summary-card p,
.language-card p {
  margin: 0;
  color: var(--secondary);
  font-size: 0.94rem;
}

.language-card {
  color: var(--text);
  text-decoration: none;
}

.language-card:hover {
  border-color: rgba(107, 89, 250, 0.4);
  transform: translateY(-2px);
}

.content-card {
  margin-bottom: 1rem;
  padding: clamp(1.25rem, 4vw, 2rem);
  border-radius: 1.7rem;
}

.content-card h2 { margin: 0 0 0.8rem; font-size: 1.38rem; }
.content-card h2:not(:first-child) { margin-top: 2rem; }
.content-card h3 { margin: 1.45rem 0 0.5rem; font-size: 1.06rem; }
.content-card p, .content-card ul { margin-block: 0.65rem; }
.content-card li + li { margin-top: 0.38rem; }
.note { border-left: 0.28rem solid var(--mint); }
.warning { border-left: 0.28rem solid var(--coral); }

.faq { display: grid; gap: 0.75rem; }
.faq details { border-radius: 1.25rem; overflow: hidden; }
.faq summary { padding: 1.05rem 1.2rem; cursor: pointer; font-weight: 730; }
.faq details > div { padding: 0 1.2rem 1.1rem; color: var(--secondary); }
.faq details p:first-child { margin-top: 0; }

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  padding-block: 2.6rem;
  color: var(--secondary);
  font-size: 0.88rem;
}

.site-footer p { margin: 0; }
.footer-links { display: flex; gap: 1rem; }

@media (max-width: 560px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .language-nav { justify-content: flex-start; }
  .hero { padding-top: 1.8rem; }
}

@media (prefers-reduced-motion: no-preference) {
  .language-card { transition: transform 180ms ease, border-color 180ms ease; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #060517;
    --surface: rgba(28, 24, 48, 0.84);
    --text: #fbfaff;
    --secondary: #c0b9d1;
    --line: rgba(239, 235, 255, 0.13);
    --link: #9b90ff;
    --shadow: 0 20px 56px rgba(0, 0, 0, 0.27);
  }
}